Experimental investigation of supersonic flow over a hemisphere |
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| Authors: | DengPan Wang YuXin Zhao ZhiXun Xia QingHua Wang LiYa Huang |
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| Institution: | 2 The Third Institute,the Second Artillery Equipment Academy,Beijing 100085,China;3 College of Aerospace and Materials Engineering,National University of Defense Technology,Changsha 410073,China |
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| Abstract: | The experimental investigation of supersonic flow over a hemisphere was conducted using Nanoparticle-based Planar Laser Scattering
(NPLS) technique in a supersonic quiet wind tunnel at Ma=2.68. Ahead of the hemisphere, boundary layer separation with the formation of a three-dimensional separated flow was observed,
which was resulted from the interaction between the three-dimensional bow shock wave and the boundary layer. The complex flow
structures of supersonic flow over the hemisphere were visualized. Based on the time correlation of NPLS images, time-space
evolutionary characteristics of supersonic flow over the hemisphere were studied, and the evolutionary characteristics of
the spanwise and streamwise large scale vortex structures were obtained, which have the features of periodicity and similar
geometry. |
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| Keywords: | NPLS shock wave supersonic flow over a hemisphere flow visualization |
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